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`. Soo, <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P.O. Box 1350, Winton, CA 95388 Phone: (209) 384-2930 <br /> Certificate #2079 <br /> Fax: (209} 384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:Cal West Concrete Method: EPA 5030/8015M,8020 <br /> of Northern California Reference Number: 1077 Instrument ID:Var-GC1 <br /> 1803 West March Lane, Suite A Matrix:Water Prepared: 4-16-97 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 4-16-97 <br /> Attn: Tim Cuellar Reported: 4-21-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration: 100 1.00 1.00 1.00 1.00 2.00 <br /> Units: ug/L ug/L ug/L ug,'L ug/L ug/L <br /> LCS Batch #: VG-4167W VB-4167W VB-4167W VS-4167W VS-4167W VB-4167W <br /> LCS % Recovery: 99.8% 97.2% 94,0% 101% 102% 101°' <br /> Surrogate Recovery: 102% 99.1% 99.1% 99.1% 99.1% 99.1% <br /> Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch #: VG-4167W VB-4167W VB-4167W VS-4167W VB-4167W VB-4167W <br /> MS % Recovery: 102% 98.1% 101% 99.9% 108% 110% <br /> Surrogate Recovery: 106% 102% 102% 102% 102% 102% <br /> MSD % Recovery: _103% 95.8% 96.4% 97.9% 105% 103% <br /> Surrogate Recovery: 105% 103% 103% 103% 103% 103% <br /> Relative % Difference: 1.18% 2.40% 4.92°x, 1.99% 3.01% 6.86% <br /> Methanol Blank : NO NO NO NO ND NO <br /> Surrogate Recovery: 101% 102% 102% 102% 102% 102% <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferentfree matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for-he samples. The LCS % recovery is used for validation <br /> of sample batch results. Due to matrix effects, the QC limits and recoveries for MS,'lv1SO's are advisory only and are not used to accept or <br /> reject batch results. <br /> ANALYST: �Ul '6 /(J/ APPROVED BY: <br /> C/ari J. Cone -Ines-C' <br /> oneesC. Phillips <br /> Environmental Lab Director <br />